【摘 要】
：
Fluorine is present in the hydroxyapatite mineral in natural tooth enamel,which plays a key role in the prevention of dental caries.The aim of this study is to synthetize the fluorinated urchin-like serried hydroxyapatite(FnUHA) particles with different d
【机 构】
：
State Key Laboratory for Modification of Chemical Fibers and Polymer Mate-rials,International Joint
论文部分内容阅读
Fluorine is present in the hydroxyapatite mineral in natural tooth enamel,which plays a key role in the prevention of dental caries.The aim of this study is to synthetize the fluorinated urchin-like serried hydroxyapatite(FnUHA) particles with different degrees of fluorine substitution and explore the effect of the fluorine element on the water absorption-solubility,mechanical strength,and biological activity of dental composites.The obtained FnUHA particles were further modified with 3-methacryloxypropyl trimethoxysilane(γ-MPS) to get the silanized FnUHA(SFnUHA)particles,which were then used as the reinforcement for dental composites.The morphology,compositional elements,and structure of the FnUHA were characterized by field-emission scanning electron microscopy(FE-SEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),X-ray diffractometer(XRD),and Fourier transform infrared spectrometer(FTIR),respectively.The mechanical properties of the SFnUHA reinforced composites with different filler loadings were measured with a universal testing machine.The results demonstrated that the 50％(mass fraction) SF5UHA filled composite exhibited the acceptable flexural strength and compressive strength,giving the respective improvements of 56.3％ and 30.8％ compared with those of the 50％ SUHA filled composite.In addition,this composite also presented lower water absorption-solubility,better in vitro bioactivity,and excellent cell viability.Therefore,fluorinated hydroxyapatite is a promising filler to improve the mechanical properties and functionality of dental composites.
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